JPS61206527A - Split die for folding and its forming method - Google Patents

Abstract

PURPOSE:To improve production efficiency by setting a couple of block dies at both side ends of many thin plate segment dies, extracting a required number of segment dies from among a group of segment dies, and rolling over and inserting the extracted segment dies between the block dies. CONSTITUTION:A couple of block dies 2A and 2B are set at both side ends of many thin segment dies 1 segmented in the width direction, respectively. The dies 1 are set on a rolling over shaft 4 of a rolling over mechanism 3 supported by an upper die body 8 to be capable of rocking in a plane being orthogonal to the segment width direction. The dies 1 are rolled over by turning the rolling over shaft 4 by 180 deg. through a driving cylinder after extraction of a specified number of dies 1 from among a group of the dies 1. The block dies 2A and 2B are moved equally and inversely each other through a screw rod 19 rotating synchronously. Production efficiency is improved because formation of an upper die with a specified width is easy.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the Invention (Field of Industrial Application) The present invention relates to a mold used for bending plate materials and a method of knitting the same. To explain in more detail, the present invention relates to a split mold that allows the width of the mold to be changed according to the bending width of the plate material, especially a split mold with four folds.
- It relates to a split mold that is effective for use in bending machines such as bending machines, bending machines, and press brakes, and a method for knitting the same.

(Prior Art) For cabinets, showcases, vending machines, freezers/refrigerators, panels, sinks, switchboards, etc., metal plates whose edges are bent into a mouth shape or a Z shape are used. To bend a plate material in this way, the short edge of the workpiece that has been cut into a predetermined size and shape is usually bent, and then the workpiece (hereinafter referred to as a blank) is rotated in a plane so that the short edge of the workpiece is bent. It is made by aligning the upper mold with the combined folding width and folding the long side edges. When folding the long side using the wing method, for example, there will be a rise due to the bending of the short side that has already been folded, so the clamp type (upper type) has a length of J22 minus the thickness of two blank plates. Therefore, a large number of upper molds with different mold widths are prepared.
It was necessary to replace the upper mold every time the blank width changed, and the replacement required time and effort. Moreover, much of this work relies on manual labor, and this is due to the automation of folding machines, such as N
C, C, NCij control is obstructed. Therefore, there has been a desire for a split type and its replacement device suitable for automatic control.

The conventional folding split type that meets this demand is the 4th type.
As shown in the figure, an upper mold body 101 attached to the lower end of the ram
, a split upper mold 102 that is slidable in the mold width direction at the lower part of the upper mold main body 101 , a large number of thin-walled upper molds 103 that are reversible, and a select claw drive mechanism 104 provided at the front part of the upper mold main body. A reversing mechanism 105 that inverts a predetermined number of thin-walled upper molds 103, and the portion of the divided upper mold 102 that exceeds the processing width is moved to a position away from the processing position by a select claw 106, that is, outward along the upper mold body 101. A mold changing device has been proposed in which a series of upper molds are formed centered by the width of the thin-walled upper mold 103 that has been moved and inverted, thereby automatically and easily replacing the molds. ing(
Utility Model No. 59-44616).

(Problems to be Solved by the Invention) However, this mold changing device only uses one split upper mold 1.
02, when cutting out a desired number of thin-walled upper molds 103 from a group of thin-walled upper molds 103 prepared for the purpose of adjusting values that cannot be divided by Thin upper die 103 is attached to spline shaft 107
Since the parts are picked up and reversed, it is not possible to distribute the split molds symmetrically with respect to a certain reference plane, for example, the center of the machine. That is, the center of the mold is not always constant and the thin upper mold 10
Since the movement is made by the selected quantity of 3, there is an inconvenience that only the center of the blank, that is, the center of the machine, and the center of the mold need to be aligned each time.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a split mold for bending that automatically distributes parts symmetrically with respect to the center of a processing machine, and a method for organizing the same.

II Structure of the Invention (Means for Solving the Problems) In order to achieve the above object, the split mold for bending of the present invention comprises a segment mold consisting of a large number of thin plates divided in the width direction, and a group of the segment molds. A pair of block molds located at both ends of the segment mold and moving in the width direction by the same amount in opposite directions at the same time, and a segment mold of the desired Ftli are extracted by removing the segment mold by the same amount relatively from both ends of the segment mold. and a reversing mechanism for reversing insertion between the block molds,
The folds are distributed equidistantly from the center of the mold to the left and right to form folds of a desired width.

In addition, the split mold for bending of the present invention has a reversing mechanism that includes a reversing shaft that supports the segment molds, and a reversing shaft that supports the segment molds to hold the entire group of segment molds and move them to the other block mold side in conjunction with one block mold. It is characterized by comprising a segment holder and a selection key that simultaneously moves the same amount in the opposite direction to the moving direction of the segment holder and selectively connects the segment mold between the block molds and the reversal axis. .

Further, in the split mold for bending of the present invention, when a bending mold of a desired width is constructed by combining a pair of block molds and a segment mold made of a thin plate, the block molds are simultaneously moved in opposite directions by the same amount. The mold is moved from the center of the mold to a position that is an integer multiple of the plate thickness of the segment mold, and between these, an integral number of segment molds are extracted from the segment mold group and placed to form a bending mold. .

(Example) The configuration of the present invention will be described in detail below based on an example shown in the drawings. In this embodiment, the present invention is applied to the upper mold of a folding machine (folding machine).

FIG. 3 shows a schematic diagram of the principle of a folding machine incorporating the split die of the present invention. This bending machine includes a blank holder 33 consisting of an upper mold 31 that is attached to a ram 34 and moves up and down, and a lower mold 32 that is fixed to a frame 35 that constitutes the main body of the bending machine, and a blank holder 33 that is held by the holder 33. a rocker arm 37 having a blade 36 disposed at its tip for vertically bending the protruding tip edge W1 of the plaque W; and a driving actuator 38.3 for swinging or horizontally moving the arm 37.
9.40 and a main body frame 35 that supports them.

One of the molds of the blank holder 33, usually the upper mold, is configured as a split mold that can be raised and lowered to allow the blank W to be taken in and out, and that the width of the mold can be changed to correspond to the width of the blank. As this upper mold 31, the split mold for bending according to the present invention can be applied.

FIGS. 1A and 1B are diagrams showing the principle of an embodiment of a split mold for bending according to the present invention as viewed from the front.

This split for bending! 8! (hereinafter simply referred to as split type)
extracts a group of segment molds 1 made of thin plates finely divided in the width direction, a pair of block molds 2A, 2B located at both ends of the segment mold 1, and a predetermined amount of the segment molds 1, and extracts the block molds 2A, 2B. Reversing mechanism 3 inserted between
It consists of The reversing mechanism 3 includes a reversing shaft 4 that supports the segment mold, a segment holder 9 that moves the segment mold 1 on the reversing shaft 4, and a set that selectively connects the reversing shaft 4 and the segment mold 1. selection keys 5A, 5
Segment type 1 removed from B and the selection keys 5A and 5B
It consists of stoppers 6 and 7 for fixing.

The segment mold 1 is made of a thin plate, for example, a thin plate with a wall thickness of about 5 mm, which is obtained by dividing a bending mold of a desired shape into fine pieces in the width direction (hereinafter simply referred to as the width direction or mold width direction).
By stacking a large number of pieces in the width direction, the main part of the split mold for bending is formed.

This segment mold 1 is attached to a reversing shaft 4 of a reversing mechanism 3 rotatably supported by an upper mold main body 8 attached to a processing machine main body, for example, a ram 34, and is oscillated in a plane perpendicular to the mold width direction. supported to move. The group of segment types 1 and the above-mentioned inversion 'NI4 are selectively connected by a set of selection keys 5A and 5B, and are in a relationship in which arbitrary quantities are interlocked. Incidentally, this group of segment type 1 is
It is held by a segment holder 9 constituting the reversing mechanism 3 and is provided so as to be movable in the width direction as a whole along the reversing shaft 4.

The segment holder 9 is attached to the upper mold body 8 with a moving gib 10, and is movable in the mold width direction. That is, the segment holder 9 is driven by one block mold 2A. be done.

Inside the reversing shaft 4, there is built-in a feed shaft 11 that holds a movable key (one of the selection keys >58) penetrating the shaft 4 and feeds in the width direction. The feed shaft 1 is supported by a cylindrical bearing 12 interposed therebetween, and is provided so as to be movable only in the axial direction by means of a sliding key 13 mounted therebetween.
A first screw rod 15 is screwed into the hollow portion 14 at the tip of the first screw, and is provided so as to be movable in the width direction by rotation of the screw 15. In addition, in order to allow the movable key 5B to move in the axial direction, the reversing shaft 4 has a long groove 1 in the axial direction.
6 is provided so that the movable key 5B can be accurately moved in the width direction, that is, in the axial direction of the reversing shaft 4 using the movable key 5B as a guide. Also, a gear 17 is provided at one end of the reversing shaft 4.
is fixed and engaged with a rack rod 18 driven by a hydraulic cylinder (not shown). Therefore, the reversing shaft 4 is rotated by a predetermined angle, for example, 180°, by the linear drive of the hydraulic cylinder.

A pair of block molds 2A and 2B located at both ends of the segment mold 1 of (above) E are each supported by a second screw rod 19 rotatably supported by the upper mold body 8, and are slidable against the segment holder 9. By being movably fitted together via the dynamic gib 27, the screw rods are provided so that they can move linearly by the same amount in opposite directions simultaneously in the width direction as the second screw rod 19 rotates. The block molds 2△, 2B consist of a block body 20 and a movable piece 21 that is attached to the block body 20 so as to be able to swing in the mold width direction. The mold width can be made variable by configuring the structure.

The movable piece 21 is attached to the block body 20 with a pin 22 so as to be movable in the width direction, and is normally biased toward the blank W side, that is, downward, by a compression coil spring 23, and is oriented almost vertically. . Therefore, when closing the mold, the movable piece 21 contacts the blank W and rotates so as to be pushed outward, so that the block mold 2A
, 2B is different when the mold is closed and when the mold is opened, and is restored to its original width only when the mold is closed.

Here, the movable piece 21 has front and side upper surfaces 21a, 21
b forms an inclined surface and is provided so as not to interfere with the bent blank front edge W1 and side edge W2. In addition, this movable piece 21 is attached to the block body 2 when closing the mold.
0 and the bottom surface, and the front inclined surface 21a and the side inclined surface 21b are attached so as to protrude from the block body 20, respectively.

The second screw rod 19 that supports the block molds 2Δ, 2B has reverse threads of the same pitch on the left and right sides, and its rotation makes it necessary for the left and right block molds 2Δ, 2B to approach the somabe, respectively. Gives a movement of separation. The second screw rod 19 and the first screw rod 15 are connected by timing bells 1 to 24, and are driven by a drive motor 25.
Rotates synchronously with the rotation of. Therefore, the first screw rod 15 and the second screw rod 1 in the reversing shaft 4
The screws 9 on the left side in the figure are cut at the same pitch and in the same direction, and are provided so that the movable key 5B and the block mold 2B on the left side in the figure can be moved by the same amount in the same direction at the same time.

In addition, the segment mold 1 released from the selection keys 5A and 5B rotates freely in the upper mold main body 8, and the block molds 2A and 2B
A stopper 6 is attached to prevent side rotation. The slots 1 to 6 are sliding keys that fit into notches 26 formed on the back surface of the segment mold 1, so that all the ceramics 1 to 1 can be reversely inserted between the block molds 2Δ and 2B. At the maximum width, that is, when all the ceramic l-types 1 are arranged uniformly to the left 6 from the mold center O (see Fig. 1 (
A), and extends to the position closest to segment type 1 on the left end. Therefore, the spacing 6 slides into the notch 26 of the front book at the same time that the segment mold 1 at the left end is removed from the selection keys 5A, 5B, and is in a relationship to restrain the ceramic members 1 to 1. Further, a stopper 7 is also provided in block V2B. The collar 7 prevents the segment mold 1 from freely rotating between the tip of the stopper 7 and the machine center O when it is removed from the selection keys 5A and 5B, and is integral with the block mold 2B. The uke is a quarter-circle shaped utensil. In addition, these stoppers 6°7
Although this is effective for inverting and inserting only the desired number of segment molds 1, it is also possible to replace it with means such as increasing the inversion angle to prevent rotation due to its own weight.

The selection keys 5Δ, 5B are a type of sliding keys that can rotate smoothly relative to the segment mold 1, and are the fixed keys 5A located on the right side of the machine center, that is, the mold center O in FIG. A group of segments consisting of a movable key 5B located on the left side as viewed from the front, and which moves in the width direction in conjunction with the block mold 2Δ. By relatively extracting the same amount of the key 5A from the segment type 1, the same amount of segment I/type 1 is extracted from the machine center O to the left and right. That is, in this embodiment, the segment only starts from one end of segment mold 1.
Since the segment mold 1 is removed from the selection keys 5A and 5B, at the same time the segment mold 1 is moved by the same amount in the opposite direction to the movable key 5B, so that the segment mold 1 is moved by the same amount from the opposite end. is substantially eliminated, and relatively the same amount of segment mold 1 is removed from both ends.

It should be noted that the embodiment in (e) above is just an example, and can be modified as appropriate without departing from the gist of the present invention.

For example, the reversing mechanism 3 may have a plurality of selection keys 5A, 5B, and may be replaced with spline shafts or the like. Further, the reversing mechanism 3 may select by causing a selection key having the same width as the segment mold 1, which protrudes arbitrarily in the radial direction, to protrude by the same amount left and right from the center of the mold toward the end. Furthermore, in this embodiment, the segment mold 1 is inverted and inserted into the block molds 2△, 2B, but the arbitrarily extracted ceramic molds 1 to 1 are raised and lowered to be inserted between the block molds 2△, 2B. You can also do it. Furthermore, in this embodiment, a variable width type having a movable piece 21 is used as the block molds 2Δ and 2B at both ends, but a width adjusting mold ( It is also possible to make the block type a fixed width type without the movable piece 21 by interposing a block type (not shown).

Although the above embodiment is an example applied to a folding machine, it can also be adopted as a split mold for other folding machines such as press brakes and bending machines.

(For now) According to the split mold configured as described above, the bending process of the plate-shaped workpiece W can be carried out with a simple operation as follows.

For example, to explain the case where the leading edge of a plate-like blank W with a width of 700 mm and a plate thickness of 0.5 mm whose both edges have already been bent is bent, the die width Ω of the upper die is Ω=L−2t −
2α However, L Ni blank outer width t: Plate thickness α: Gap (equal distribution on both sides), Ω + 2α = 700- (2X0.5> = 699mm. In this case, the maximum width of block types 2A and 2B is 200mm.Then, the maximum width of block molds 2A and 2B at both ends is 20mm.
By subtracting 0mm x 2, the maximum width of segment type 1 is 299mm. Here, if the width direction dimension of one segment mold is 5 mm, the desired number of segment molds is 299÷5=
The total number of sheets is 59.8, but if we round down the fractional 0.8 and get 59, a=y, (700-(2x200>-(2x
0.5>-(59x5))=2mm, but the gap is 2m
A length of about m does not pose a problem for practical bending work.

Note that the mold width Ω is cut off at a pitch of 5 mm, which is the thickness of one segment mold.

This segment type is extracted by rotating the first and second screw rods 15 and 19 by a predetermined amount according to a program in advance to move the segment type 1 body to the left side in the figure and at the same time move the movable key 5B upward in the figure. Move the same amount to the right side, remove the segment molds 1 by the same amount from both the left and right ends, and pick up 147.5 mm left and right from the center O of the processing machine, that is, 59 segment molds 1. Selection keys 5A, 5
The segment mold group 1 on the left side that has come off from B immediately engages with the stopper 6.7 attached to the upper mold body 8 or the block mold 2B, and free rotation is prevented.

A predetermined number of segments 1 to 1 from a group of segment types 1
! After 8!1 is selectively extracted, the drive cylinder at one end of the reversing shaft 4 is actuated to rotate the reversing shaft 4 at a predetermined angle, usually 180
Rotate ° to invert the group of extracted segment type 1. At this time, the block molds 2Δ and 2B at both ends are also moved by the same amount in opposite directions due to the plowing of the second screw rod 19, which is rotated synchronously by the timing belt 24.
A gap of the same amount as the width of the extraction segment mold 1 is provided. Therefore, the extracted segment mold 1 is inverted and inserted between the block molds 2Δ and 2B to form an upper mold of a predetermined width. Ceramen 1 which is reversed at this time
~The mold 1 is positioned by coming into contact with the first learning gib 27 attached to the segment holder 9.

Thereafter, the mold is closed and the plate blank W placed in a predetermined position is sandwiched. At this time, the movable pieces 21 of the block dies 2A and 2B at both ends of the descending upper die are pushed down toward the lower die 32 side by the plow of the spring 23, reducing the die width, so that the blank W is folded sideways. Edge W2 is block type 2 at both ends
The mold can be inserted without interfering with A and 2B. A block type 2A in which the side bending portion W2 of the blank W is avoided.

2B, since the movable piece 21 abuts against the blank W and is relatively pushed upward and expanded, it automatically spreads to the original mold width and clamps the blank W. Once, the upper mold extracts the desired number of segment molds 1 and blocks molds 2△, 2.
After being reversely inserted between B, the mold can be closed and an upper mold of a predetermined width can be constructed by simply lowering the blank W without interfering with the side edge W2 of the bent blank W. Furthermore, in this device, the upper die length is always distributed in equal amounts to the left and right sides of the machine center O, so there is no need to perform alignment with the mounted blank W.

After the mold is closed, the tip of the blank is bent into a predetermined shape by swinging the bending arm 37.

After the predetermined bending process, the upper die 31 is lifted up by the ram 34.
After slightly raising the body, push the blank W forward so that it does not interfere with the front inclined surface 21a of the block mold 2△, 2B or the front edge W1 of the blank that was bent when rising, and then push it to the rising end again. raise. Then, prepare for the next processing.

Note that the operation of the cylinder, drive motor 25, etc. is controlled by, for example, N.
This type of work can be automated when carried out by C control or CNC control.

III. Effects of the Invention As is clear from the above description, the present invention has a segment mold made of a large number of thin plates divided in the width direction, and a segment mold that is located at both ends of this group of segment molds and is simultaneously opposite to each other in the width direction. A pair of block molds that can be moved in the same direction and whose outer edges are swingable in the width direction to make the mold width variable, and the same amount of segments 1 to 2 are removed relatively from both ends of the segment mold to produce the desired quantity. A split mold for bending is constructed from a reversing mechanism that extracts segment 1 to mold and reversely inserts it between the block molds, and simultaneously moves the block molds by the same amount in opposite directions to separate the segment molds from the center of the mold. While transferring to a position that is an integer multiple of the sheet thickness, an integral number of segment molds are extracted from the segment mold group and placed between these positions to construct a folding mold of the desired width. Regardless of the extraction segment mold, the extraction segment mold is divided equally from the mold center to the left and right to form a folding mold of the desired width, and the center of the processing machine and the mold center are automatically aligned. By positioning the blank at the center of the machine and feeding it, the bending process can be carried out at the same time as the blank is input without performing a centering operation.For this reason, various information regarding the blank, such as dimensions, shape, bending conditions, and work procedure, can be carried out one after another. If you memorize the information and perform NC control or CNC control, after one bending operation is completed, you can immediately knit the mold to the desired width and proceed to the next bending process, allowing for efficient high-mix, low-volume production. It becomes realizable.

[Brief explanation of the drawing]

Fig. 1 is a principle diagram showing an embodiment of the split mold for bending of the present invention when viewed from the front, (A> is the state before the segment is reversed and inserted at the maximum mold width, and (B) is the state before the segment is reversed and inserted at the minimum mold width. The states are shown respectively. Fig. 2 is a cross-sectional view of the same split die. Fig. 3 is a principle diagram showing the outline of a plate bending machine to which the split die of the present invention is applied, and Fig. 4 is a conventional split die. It is a front view showing the outline of 1... segment type, 2△, 2B... block type,
3...Reversing mechanism, 4...Reversing axis, 5A, 5B...Selection key, 15.19...Screw rod, V zoning...7)

Claims (3)

[Claims] (1) A segment mold consisting of a large number of thin plates divided in the width direction, a pair of block molds located at both ends of this group of segment molds and simultaneously moving the same amount in opposite directions in the width direction, and the segment mold. It consists of a reversing mechanism that removes the same amount of the segment molds from both ends relatively, extracts a desired number of segment molds, and inverts and inserts them between the block molds, and divides the segment molds in equal amounts to the left and right from the center of the mold and bends them to the desired width. A split mold for bending processing characterized by consisting of a mold. (2) The reversing mechanism includes an inversion shaft that supports the segment molds, a segment holder that holds the entire group of segment molds and moves in conjunction with one block mold toward the other block mold, and a moving direction of the segment holder. and a selection key that simultaneously moves the same amount in a direction opposite to that of the block mold and selectively connects the segment mold between the block molds and the reversal axis. Split type for bending. (3) When forming a bending mold of a desired width by combining a pair of block molds and a segment mold made of a thin plate, the block molds are simultaneously moved in opposite directions by the same amount to separate the segment mold plate from the center of the mold. A split die for bending processing, characterized in that the split die is transferred to a position that is an integral multiple of the thickness, and an integral number of segment dies are extracted from a group of segment dies and placed therebetween to form a bending die. How to organize.